Domino's Pizza is offering 50% off on all pizzas ordered online. The deal is in celebration of hitting the $1 billion mark in U.S. digital sales in one year. Yep, that’s right—$1 billion worth of pizzas were purchased online by American consumers in only 12 months. Ordering through Domino's digital platforms has grown immensely since debuting in 2008 – and now makes up over 30 percent of Domino's sales in the U.S. That is quite a feat.

The special deal is only available through Domino's digital ordering channels, which include online ordering, mobile ordering and Domino's iPhone and Android apps. The offer is good through Sunday, June 17.

"We love our online customers, and have learned so much from them during the past five years about how we can continue to deliver the best online ordering experience in the industry," said Russell Weiner, Domino's Pizza chief marketing officer. "Reaching $1 billion in online sales during a one year time period is a major milestone, and we hope offering this amazing deal for an entire week lets our fans and customers know how much we appreciate them.”